Empennage Attach

August 10,2004

 

Page 11-10

 

Step 1: Check for proper adjustment of each of the CT Q-43 elevator Trim Cables by running the Trim Servo through it's full range of motion. Adjust the engagement of the rod end bearings and the elevator trim cable position on the F-1095G Trim Cable Anchor Brackets as required to achieve the trim bellcrank motion shown in Figure 1.

 

Note: I found using the hardware called for, the end of the bolt hit the edge of the opening where it passed thru the Trim Bracket so used the nibbler's to remove about a 1/16" and it cleared it OK

 

Step 2: Remove the E-616PP Cover Plate-Elevator Trim /WD-415 Elevator Trim Cable Anchor Bracket Sub-Assemblies from the bottoms of both elevators.

Loosely place the F-1095 Elevator Trim Actuator Sub-Assembly in the aft fuselage

Route the CT Q-43 Elevator Trim Cables through the holes in the Horizontal Stabilizer Inboard Nose Ribs, then through the snap bushings installed in the Horizontal Stabilizer Front Spar and Horizontal Stabilizer Rear Spar, through the Elevator leading edges, then finally through the openings in the bottoms of the elevators. See Figure 2.  NOTE: This proved to be quite a challenge as pushing the cable back through some very small blind holes did not work for me. I pushed a long piece of brazing rod up from the back and taped it to the end of the cable and was able to pull it through from the back. If the snap bushing were installed facing incorrectly  back when they were put it in it pulls loose out of the hole. I am going back to the step in building the horizontal stab and will make a note of it.

Progressively move the elevator trim actuator sub-assembly into final position while routing the elevator trim cables. Here is the picture of it coming out the back.

After the elevator trim cables have been routed, attach the elevator trim actuator sub-assembly to the underside of the F-1014 Fuselage Aft Deck through holes pre-punched in the fuselage aft deck using the screws called-out in Figure 2.

 
Step 3:

Thread the E-616PP Cover Plate-Elevator Trim/WD-415 Elevator Trim Cable Anchor Bracket Sub-Assemblies on to the CT Q-43 Elevator Trim Cables. Adjust so that the elevator trim cable anchor brackets are centered on the 7/16 threaded portion of the elevator trim cable anchor points. Attach the cover plates to the bottoms of the elevators.

Note: It was hard to turn the nut with the plate attached as there is not enough clearance without bending the cable down sharply. On the second one I drilled the four pop rivets of and got the nut loose and it is easy to turn on then. I can just pop rivet the plate back on when I want. It is being held on with clecos

Run the trim servo to the "Full Nose Up" position.

Temporarily attach the elevator trim cables to the elevator trim tab horns using the hardware called-out in Figures 2 and 3. Of the three washers called-out in Figure 2, one is t be installed between the cotter pin and the outer surface of the clevis while the other two washers are to be installed between the E-917/E-918 (left side) and E-1017/E-1018 (right side) Elevator trim Horn and the inner surface of the clevis; one washer on the outboard trim tab horn and one washer on the inboard side of the elevator trim tab horn.

Adjust the engagement of the jam nut and clevis onto the trim cable so that the tabs are in the 35 degrees TAB DOWN position as shown in Figure 3.

Note: I have spent quite a bit of time adjusting things. The plans kind of just leave you with seeing the NOSE UP trim requires the tabs to deflect 35 degrees. There is no mention of the degrees of nose down tab travel. Somewhere in reading it seems that the mention of the airplane to be nose heavy, especially when the flaps are lowered and power pulled off, so there is more of a requirement for more nose up trim than nose down. The cable to the left tab has less throw than the right, hence it will move the tab less distance. I hope all this reasoning is right. It appears that both tabs are deflected 35 degrees nose up, while the movement of the left tab stops at about the trail position and the nose down trimming is done by the right tab which deflects quite a ways. I hope this is right, I am leaving it where it is and going to do more research.

Permanently attach the clevis to the trim tab horn using the hardware called-out in Figures 2 and 3.  (This step my be delayed until the final assembly.)

 

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